[ODFPlugtest] writing implementation specific defaults

[Sander Marechal]

Darabos Dániel wrote:
> it would
> make it clear how the absence of this information is to be handled and
> when the authoring software has to make the font size explicit, so it
> seems beneficial to me.

The point is that the information should never be absent. If it's never
absent then you don't have to think about what to do when it is absent.

-- 
Sander